Tak si pusti GPU-Z a to bude pre Teba ešte len šok...
Ak karta "odpočíva" potom uvidíš možno ako u mňa:
GPU Core Clock = 157.0 MHz
GPU Memory Clock = 300.0 MHz

1200.0 MHz = 4800.0 MHz efektívne !!!

Tejto technológgi sa hovorí

AMD PowerPlay™

Dynamically manage power efficiency and take control of your performance with AMD’s revolutionary AMD PowerPlay TM power management technology delivering high performance features when needed and conserving power when the demand on the graphics processor is low. This seemless technology dramatically reduces the overall power consumption allowing for break-through energy efficiency.